Flights for UA521 These are not all the flights that UA521 has taken, just some of them that have flown in or out of SFO

UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 18, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N34137. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 17, 2022, was operated by another airline. It departed from gate E12. Passengers were flying aboard an Airbus A320-200 with tail number N482UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 17, 2022, was operated by another airline. It arrived at gate F17. Passengers were flying aboard a Boeing 757-200 with tail number N19141. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 16, 2022, was operated by another airline. It departed from gate E6. Passengers were flying aboard a Boeing 737-800 with tail number N39297. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 16, 2022, was operated by another airline. It arrived at gate F12. Passengers were flying aboard a Boeing 757-200 with tail number N14115. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 15, 2022, was operated by another airline. It departed from gate F3A. Passengers were flying aboard an Airbus A319 with tail number N876UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 15, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N17133. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 14, 2022, was operated by another airline. It departed from gate F4. Passengers were flying aboard an Airbus A320-200 with tail number N402UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 14, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N19141. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 13, 2022, was operated by another airline. It departed from gate F1. Passengers were flying aboard an Airbus A320-200 with tail number N494UA. See all the flights for UA521.
UA521 (JFK-SFO)
This United Airlines flight between John F Kennedy International Airport and San Francisco International Airport, on July 13, 2022, was operated by another airline. It arrived at gate F14. Passengers were flying aboard a Boeing 757-200 with tail number N33103. See all the flights for UA521.
UA521 (SFO-PDX)
This United Airlines flight between San Francisco International Airport and Portland International Airport, on July 12, 2022, was operated by another airline. It departed from gate E7. Passengers were flying aboard an Airbus A320-200 with tail number N481UA. See all the flights for UA521.